Abstract: An alumina substrate has a front surface with a semiconductor gas sensor main body attached thereon for specific detection of a surface exposed gas, and has a rear surface formed with a glass layer and a gold paste layer as superposed on the surface, and bonded to a gold plating layer on a frame by parallel gap welding. The gold paste layer is welded to the gold plating layer with the heat of welding. The glass layer prevents transmission of thermal impact of die bonding to the substrate.

Abstract: A rotary compressor of the type having an outer metal cylinder casing, a metal cylinder with a vane slot and a vane and the method of assembling the compressor by forming the cylinder with a circular chamber, the center of which is in alignment with the central axis of the cylinder and having a circular outer wall slightly smaller than the inside diameter of the casing. A vane slot is cut in the cylinder which slot is open at one end into the chamber. A vane is placed in the slot to divide the chamber into a high pressure side and a low pressure side. The cylinder has formed therein three curved elongated ports spaced from each other in the cylinder between the chamber and outer wall. The length of each port and thickness of the metal between the port and outer wall of the cylinder cooperate to provide adequate strength for welding and sufficiently flexible to absorb any significant distortion forces caused by welding without transmitting the distortion forces to the vane slot.

Abstract: An annular beam 46 which is hollow and which extends circumferentially about an annular flow path 22, 24 for working medium gases is disclosed. The annular beam supports and positions both a shroud 42 and a fabric 44 for containing particles having axial and radial velocity. The annular beam has a first wall 48 and a second wall 50. The second wall is spaced radially from the first wall. A plurality of annular plates 52 extending circumferentially about the interior of the beam. The plates are attached to the first wall and to the second wall. In one detailed embodiment the annular plates have a C-shaped cross section formed of a circumferentially extending rib 58 and two axially oriented legs 60, 62. The radial height of the rib is many times greater than the radial height of the legs. A method of fabricating the annular beam is disclosed.

Abstract: Portable apparatus for welding by means of an oxy-gas flame, such as an oxy-acetylene or an oxy-petroleum gas flame or the like, comprises a device for supplying the gaseous fuel in gaseous form under pressure, a combustion oxygen generator and means for pressuring said combustion oxygen generator so as to make the oxygen available at a pressure compatible with the fuel delivery pressure, these means being realized by a connection between the oxygen generator and the fuel supply device.

Abstract: The method of making a comminutor plate, particularly for pulp refining machines, includes the steps of arranging at least two separate annular support members concentrically and with radial spacing from each other, a set of elongated strip-shaped blades is arranged and welded in a predetermined relative distribution on the support members. A flowable solidifiable material is introduced in the spacing between the support members. The material is permitted to solidify to thus bind the support members to each other in the radial space therebetween.